Situation: Need to import data into the database through Excel表, but the backend staff is on a business trip, and I can only PHP, I have never used node, so I can only import Excel文件 in the front-end, and then call the single adding interface in the background in a loop.
库： Excel.js (version 4.3.0)
CDN address:
<script src="https://cdn.bootcdn.net/ajax/libs/exceljs/4.3.0/exceljs.min.js"></script>
Excel.js Chinese documentation: https://gitee.com/alan_scut/exceljs
Below is a dynamic Excel form
The following are the objects obtained from the file file (Excel file):
The following is the data output in the code that needs to be inserted:
Code:
Instructions:importExcal()
// 全局函数执行完成后执行组件的钩子函数、组件事件、自定义事件
// 导入Excel表
async function importExcal() {
// 文件内容 (这里是从input file里面获取到的内容)
var file = input_file;
// 提交后端数据的整体数组
var data_arr = [];
// 行程的最大列数（包含前面不变的）
var stay_col_num = 0;
if (file) {
// 判断文件类型
let filetype = file.name.split('.')[file.name.split('.').length - 1]
let filetypes = '.xlsx,.xls'
if (filetypes.indexOf(filetype) === -1) {
this.$message({
message: '请上传 .xlsx 或 .xls 文件。',
type: 'warning'
})
return;
}
// 读取文件文件
const reader = new FileReader();
// file.raw是具体的文件内容，需要看一下你获取到的是file.raw，还是file[0]即可 将文件转为 ArrayBuffer 格式
console.log("这里是获取到的file文件内容：", file)
// 这里要用 readAsArrayBuffer 转成buffer，因为下面读取要用到 buffer 才可以
reader.readAsArrayBuffer(file.raw);
reader.onload = function (event) {
try {
const result = event.target.result;
var workbook = new ExcelJS.Workbook();
// 读取 buffer 内容
workbook.xlsx.load(result)
.then(async function () {
// 迭代所有sheet （如果只有一个，可以通过名称获取 var worksheet = workbook.getWorksheet('My Sheet');）
workbook.eachSheet(async function (worksheet, sheetId) {
// 清空数据数组
data_arr = [];
// 获取 形成安排 的列数(从第8列开始的), 总不会超过100天，所以写个100
// 在这里获取 形成列的长度，是因为这里是表头，不会像内容一样出现空白单元格，造成无法获取到最终列的情况
for (let j = 8; j <= 100; j++) {
// 当列到 行程安排 且，j+1 不是 行程安排的时候，就是行程安排的列宽
if (worksheet.getCell(`${
getLetter(j)}2`).value == '行程安排' && worksheet.getCell(`${
getLetter(j + 1)}2`).value !== '行程安排') {
stay_col_num = j;
// 如果两个都有值的话，就跳出循环
break;
}
}
// 迭代工作表中具有值的所有行
worksheet.eachRow(function (row, rowNumber) {
// 数据是从第四行开始
if (rowNumber >= 4) {
// data_arr.push(row.values)
// 每行的数据
let row_data = row.values;
// 传给后端的对象
let data_obj = {
"guest": "",
"name": "",
"sex": "",
"company": "",
"job": "",
"phone": "",
"stay": []
}
// 循环每行的数据
row_data.map(function (item, index, arr) {
// 如果是前7列，则是固定列的值，直接复制即可，否则的话则是 动态的行程安排
if (index <= 7) {
switch (index) {
case 2:
// 嘉宾类别
data_obj.guest = item ? item : "";
break;
case 3:
// 姓名
data_obj.name = item ? item : "";
break;
case 4:
// 性别
data_obj.sex = item ? item : "";
break;
case 5:
// 单位
data_obj.company = item ? item : "";
break;
case 6:
// 职务
data_obj.job = item ? item : "";
break;
case 7:
// 手机号
data_obj.phone = item ? item : "";
break;
}
} else {
// 行程安排（从第八列开始到形成的最后一列结束）
if (index >= 8 && index <= stay_col_num) {
if (worksheet.getCell(`${
getLetter(index)}${
rowNumber}`).value == '是') data_obj.stay.push(worksheet.getCell(`${
getLetter(index)}3`).value);
}
}
})
// 将插入后台的数据添加进数组
data_arr.push(data_obj);
}
});
console.log("全部需要插入数据库的数据的数组：", data_arr)
// 这里使用了 Promise 解决在for循环内，使异步接口，进行同步提交的问题；文章后面有详细说明
for (let i = 0; i < data_arr.length; i++) {
let result_data = await createUser(data_arr[i]);
if (!result_data.result) {
// 如果出错，就跳出循环
this.$message({
message: `第 ${
i + 1} 行数据 ${
data_arr[i].name}(${
data_arr[i].phone})，由于 ${
result_data.msg} 导入失败`,
type: 'error'
})
// 跳出循环
break;
}
}
});
});
} catch (err) {
this.$message({
message: '读取文件错误',
type: 'error'
})
console.log('err', err);
}
};
} else {
this.$message({
message: '请选择文件',
type: 'error'
})
}
}
// 添加用户信息接口
async function createUser(data) {
return await new Promise(function (resolve, reject) {
// 处理异步逻辑时候调用resolve和reject函数
axios({
method: 'POST',
url: `${
base_url}/api/add`,
headers: {
// 没有可以不要token
// authorization: `bearer ${token}`
},
// 数据
data: data
}).then(res => {
let resp = res.data;
if (resp.code == 1) {
if (resp.data.code == 200) {
resolve({
"result": true
});
}
} else {
resolve({
"result": false,
"msg": resp.msg
});
}
}).catch(req => {
reject({
"result": false,
"msg": ""
});
});
});
}
// 获取第N个字母
function getLetter(num) {
return String.fromCharCode(64 + num);
}
Summary of methods used in the code:
Create a new workbook
var workbook = new ExcelJS.Workbook();
Read buffer contents
workbook.xlsx.load(data).then(function() {
// 其他代码
});
Iterate over all sheets
workbook.eachSheet(function(worksheet, sheetId) {
// 其他代码
});
Get table by name
var worksheet = workbook.getWorksheet(‘My Sheet’);
Get table by ID
var worksheet = workbook.getWorksheet(1);
Iterate over all rows in a worksheet that have values
worksheet.eachRow(function(row, rowNumber) {
console.log(‘Row：’ + rowNumber + ’ = ’ + JSON.stringify(row.values));
});
Get cell (A2)
var collectcell = worksheet.getCell(‘A2’);
In the for loop, the asynchronous interface becomes synchronous submission
The address of my article:The asynchronous interface in the front-end JS for loop becomes synchronous submission (JavaScript for loop changes from asynchronous to synchronous)
Some problems encountered:
1. Excel.JS supports different data reading methods and obtains different data types. For example: file, stream, buffer
In addition,
Friends who are interested can also try itSheetJS. It seems to have more functions. I will need to use excel next time. I'll try it when I'm ready.
SheetJSChinese documentation:https://github.com/rockboom/SheetJS-docs-zh-CN